【題目】I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.

A. hadn’t done B. didn’t do

C. haven’t done D. don’t do

【答案】B

【解析】試題分析：根據(jù)語境“我無法想象如果我們不采取措施阻止空氣污染，我們將呼吸什么樣的空氣”可知該處是對(duì)將來情況的虛擬，if條件句要用一般過去時(shí)，故選B。

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